[whatwg/xhr] Editorial: add an IDL index (#113)

Not sure if you want to add the terms index too, but I was looking for the IDL index and noticed it was missing, so here's a drive-by fix.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/xhr/pull/113

-- Commit Summary --

  * Editorial: add an IDL index

-- File Changes --

    M xhr.bs (2)

-- Patch Links --

https://github.com/whatwg/xhr/pull/113.patch
https://github.com/whatwg/xhr/pull/113.diff

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